Pressure and oxygen control system for fixed bed aeration gasification process

Abstract

The invention discloses a pressure and oxygen control system for a fixed bed aeration gasification process. An outlet of a blast blower is connected with an air output pipe, and an oxygen output pipeis connected with an aeration air main after converging and communicating with the air output pipe; the pressure and oxygen control system comprises an escape pipe and a pressure and oxygen control PLC, one end of the escape pipe communicates with the aeration air main, the other end of the escape pipe is connected to an inlet of the blast blower, and a pipeline of the escape pipe is provided withan escape regulating valve; the aeration air main is provided with an air pressure transmitter and an oxygen analyzer; the air pressure transmitter and the oxygen analyzer are respectively connectedto an input interface of the pressure and oxygen control PLC, and an output interface of the pressure and oxygen control PLC is respectively connected to the escape regulating valve and an aeration gasification PLC; and the pressure and oxygen control PLC controls the opening of the escape regulating valve according to the air pressure and oxygen concentration of the aeration air main and outputsan aeration control signal to the aeration gasification PLC, and the aeration gasification PLC controls an aeration regulating valve, so that the air pressure and oxygen concentration of the aerationair main are kept stable.

Description

Technical field [0001] The invention relates to the technical field of synthetic ammonia gas production, in particular to a pressure and oxygen control system used in a fixed bed oxygenation process. Background technique [0002] In the synthetic ammonia gas production process, with various technological advancements and energy-saving transformations of fixed-bed gasifiers, fixed-bed oxygen-enhancing technologies have emerged along with energy-saving transformations. The most significant effect is to change the coal consumption per ton of ammonia in the existing synthetic ammonia companies, with moderate investment and significant effects. [0003] However, there are also shortcomings in actual operation, especially in the normal state of oxygen distribution, the oxygen concentration of the air manifold is relatively stable, but when the blower valve alarm occurs or the ash is stopped during the furnace, the oxygen concentration of the air manifold increases instantly. The next ga...

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Problems solved by technology

[0004] At present, the method of reducing the air pressure into the furnace is generally adopted to maintain the stability of the furnace condition, but this will reduce the load of the gas-making furnace, affect the demand for gas supply, and is not conducive to the gas supply for production, resulting in a tense situation

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